Sandpapering-machine.



PATENTBD JUNE 2o, 1905.

G. P. HARMAN & F. L. CROOKS.

SANDPAPERING MACHINE.

APPLIGATION FILED ooT.s1,19o4-.

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No. 792,825. Y PATBNTED JUNE 20, 1905. G. P. HARMAN & F. L. CROOKS.

SANDPAPBRING MACHINE.

APPLICATION FILED 0GT,31,1904.

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i UNITED STATES Patented June 20, 1905.

PATENT EEieE.

GEORGE P. HARMAN ANI) FRANK L. CROOKS, OF WILLIAMSPORT,

PENNSYLVANIA.

SANDPAPERlNG-IVIACHINE.

SPECIFICATION forming' part of Letters Patent No. 792,825, dated June 20, 1905.

Application iiled October 3], 1904. Serial No. 230,840.

To all whom, it iii/ty conoci/'71,:

Be it known that we, GEORGE VP. HARMAN and FRANK L. CRooKs, citizens of the United States, residing at Williamsport, in the county of Lycoming and State of Pennsylvania, have invented a new and useful Sandpapering-Machine, of which the following is a specification.

This invention relates generally to sandpaperingmachines, and particularly to one adapted for finishing the molded edge portions of door and blind panels.

The object of the invention is in a ready, simple, practical, and rapid manner to finish the molded portion of door and blind panels irrespective of their length; to insure accuracy of work and the proper treatment of the entire molded surface or surfaces on one or both sides of a panel; to provide for the proper adjustment of all the parts to insure finished workmanship; to provide for accu- 'rate guiding of work through the machine and the proper adjustment of the abradingbelts with relation thereto; and generally to improve, increase the efciency and working capacity, and to simplify the construction of such machines.

With the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a sandpapering-machine, as will be hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate corresponding parts, there is illustrated one form of the embodiment of the invention capable of carrying the same into practical operation, it be- 5 is a sectional detail view through one of the sandpaper-belt-driving pulleys.

rPhe frame of the machine comprises four corner-uprights 1, which are connected and braced near their lower ends by iongitudinal beams 2 and transverse beams 3. Upon the upper ends of the corner-posts are secured two longitudinal beams 4, to which are secured six transverse beams 5, 6, 7, 8, 9, and 10. All the beams are connected in any suitable manner to secure stability and freedom from vibration, and while the arrangement of the beams will be that which will generally be employed it is to be understood that the invention is not to be limited thereto, as other arrangements may be employed and still be within its scope.

The present invention resides in the novel arrangement of sandpapering mechanism embodying endless belts, together with means for causing the belts properly to impinge the work at different angles, thus to secure the highest eiiciency and best character of work possible.

` The two sandpapering and abrading belts 11 and 12 may be constructed in the manner usual to such parts and are driven and held in vertical position by two pairs of pulleys 13 14, 15 16, the pulleys 14 and 16 being the driven ones. The pulleys 14 andy 16 are mounted upon stub-shafts 17 and 18 and the pulleys 13 and 15 upon driven shafts 19 and 20, to which they are suitably keyed, as shown in Fig. 1. The shafts 19 and 2O (one only being' shown in Fig. 2) are mounted in boxings or bearings 21, which are carried by one of the transverse beams 3. Upon each of these shafts is mounted a pulley 22, around which pass belts 23 to and around pulleys 24, carried by a shaft 25, journaled in suitable boxes 26, secured to two of the corner-uprights 1. Each of the pulleys 14 and 16 is similarly combined with its shaft, and a detail view of this arrangement is shown in Fig. 5, wherein the pulley 16 is shown. The stubsliaft 18, which is in the nature of a collar, is mounted upon a bolt 27, which is carried by a block or bearing 28 and carries at its upper end a nut 29, by which the shaft is held in position, there being a spacer 30 interposed between the under side of the pulley and the block or bearing 28 to prevent interference between the parts. As it will be necessary toadjust the tension of the belts 11 and 12 in Order to cause them to do proper work, it is essential that the pulleys 14 and 16 be movable independently of each other and relatively to the pulleys 13 and 15, and this movement is effected through the medium of an adjusting-bolt 31 for each belt, the head 32 of which bears against one edge of the block or bearing 28 and the threaded end of which projects through the cross-beam 10. Mounted upon the bolt and bearing against the crossbeam 10 is a resilient buffer 33, which may be a rubber annulus, as shown, or a coiled spring, and bearing against each buffer is a washer 34, which is borne upon by a nut 35, carried by each of the bolts. The object of providing the buers 33 is to permit the blocks or bearings to yield should such tension be applied to the belts as would tend to tear or disrupt them, thereby effecting a saving in material and avoiding loss of time that would be required to rebelt the machine. The blocks or bearings 28 are guided for longitudinal movement by two guides or rods 36, Fig. 1, which are secured to their terminals in the cross-beams 9 and 10, respectively. It will be seen by this arrangement that when either of the nuts 35 is turned in the appropriate direction the correlated bearing will be moved in the direction to place the belt to be adjustedunder the desired tension for the purpose of securing accurate and smooth work.

Motion is imparted to the shaft 25 and thence to the belts 23 and shafts 19 and 2O through the medium of a pulley 37, fast on the shaft 25, there being provided a loose pulley 38, upon which the drive-belt (not shown) may be shifted when desired.

Secured upon the cross-beams 7 and 8 are four standards 39, 40, 41, and 42, which are adapted to support a pair of work-guides 43, the opposed faces of which at their terminals are slightly rounded to facilitate insertion of the work W. The work-guides are supported from the standards by four bolts 44, which are seated in recesses 45 in the upper ends of the standards and carry at their outer ends adjusting-nuts 46. Mounted upon each of the bolts is a coiled spring 47, the terminals of which bear, respectively, against the inner face of the standards and the outer face of the work-guides, and these springs operate to support the work-guides for yielding movement and to compensate for any inequality present in the work designated W. By turning the nuts 46 in the appropriate directions the workguides will be caused to approach or recede, thus to provide for the insertion of work of different sizes.

In order to cause the belts 11 properly to engage the work, there are provided two blocks 48 and 49, the opposed faces of which are covered by strips 50 of yielding material, preferably of carpet, and the carpet has metallic facings 51 to protect the cushions 50 from rapid wear. The facings 51 are not rigidly secured throughout their entire width to the blocks, but only at their upper ends, and are thus adapted readily to yield to pressure. To the upper side of each block is secured a plate 52. The opposed ends of these plates are rounded or beveled, as at 53, to turn the edges of the belts, thus to cause them to engagethe work and effect proper sanding or cutting of all the parts to be 'treated The-blocks 48 and 49 are pivoted between pairs of standards 54, carried by bed-pieces 55 and 56, mounted between the frame-beams 7 and 8, the fulcrums 57 of the blocks being disposed near their inner ends. The block 48 is held in adjusted position by means of a bolt 58, the head of which bears against the under side of the bedpiece 56, a nut 59, carried by the bolt, operating to eect arcuate adjustments of the block. To hold the block in yielding adjusted position, there is acoiled spring 60 provided, which surrounds the bolt 58 and bears against the under side of the block andl the upper side of the bed-piece, as clearly shown in Fig. 3, and to permit the block to be moved horizontally to and from the work to allow the machine to accommodate work of various sizes the bed-piece 56 is mounted upon two guides 61, secured to one of the side beams 4,

and a bed-block 62, disposed below the blocks. Secured to the bed-piece is a bolt 63, which projects outwardA through the frame-beam 4 and carries on its free end a nut 64, acoiled spring 65, mounted upon the bolt 63, operating normally to hold the block to the work. By turning the nut 64l the bed-piece 56, and with it the block 48, will be moved bodily to and from the work. The block 49 is adapted for adjustment in an arc of acircle in the same manner as the block 48 and for the same purpose. This is secured through the medium of a bolt 66, which passes through a block 67, bearing against the under side of the bed-piece 55 and projecting upward through the block 49, the upper end of the bolt having combined with it a nut 68, by whichthe desired adjustments of the block are accurately secured, a spring 69, mounted upon the bolt and bearing at one end against a block 67 and at its other end against the under side of the block 49, serving to hold the latter yieldingly in its adjusted position. The bed-piece is adapted for horizontalfadjustment; but the adjustment is preferably of a character that will be fixedthat is to say, any change in the space between the opposed faces of the blocks 48 and 49 being secured by adjusting mechanism combined with the bed-piece 56. This permanent adjustment is secured by means of a` bolt 69, which projects through a cleat 70, which bears against cross-beams 7 and 8, the upper end'of IOO IIO

the bolt being projected through the bed-piece and having combined with it a nut 71,which upon being tightened w-ill clamp the cleat 7 O rmly against the cross-beams, and thus hold the bed-piece 55 and block 49 in their adjusted position.

It will be seen from the description thus far given that both of the blocks 48 and 49 are capable of longitudinal and arcuate adjustment, and by this arrangement the machine is adapted for doing any kind of work in a thoroughly practical and satisfactory manner.

Disposed upon the upper face of the bedblock 62 is a metallic plate 71, which is capable of being adjusted vertically by means of a screw 72, the function of this plate being to serve as a bearing for the bottom edges of the belts to steady them while in motion and overcome vibration.

Arranged longitudinally of the frame is a work-support 73, the intermediate portion 74 of which is reduced to a width somewhat less than the space between the work-guides when in their closest adjustment, and this intermediate portion may be integral with the worksupport or removable therefrom, as shown in Fig. l. This work-support is held adjustably and yieldingly combined with a centrally-disposed frame-beam 75 through the medium of a plurality of bolts 76, carrying adjustingnuts 77, the bolts having' surrounding them coiled springs 78, which bear, respectively, against the under side of the work-support and the upper side of the frame-beam 75.

It will be seen from the foregoing description that all the operative parts of the machine are cushioned, thereby to permit requisite yield and also to obviate vibration.

The general arrangement of parts herein shown are those that have been found in practice to be thoroughly eective for the purposes designed; but it is to be understood that various changes may be 'resorted to and still be within the scope of the invention.

Having thus described the invention, what is claimed isl. In a sandpapering-rnachine, a pair of abrading-belts, a pair of pressure-blocks having their opposed faces cushioned and their upper faces provided with means for curving the belts, and means for effecting arcuate and horizontal adjustment of the blocks.

2. In a sandpapering-machine, a pair of abrading-belts, adjustable pressure-blocks coacting therewith, and work-guides disposed above the blocks.

3. In a sandpapering-machine, a pair of abrading-belts, a pair of adjustable pressureblocks coacting therewith, and adjustable work-guides disposed above the pressureblocks.

4. In a sandpapering-machine, a pair of pressure-blocks mounted for arcuate and hori- Zontal movement, adjustable work-guides disposed above the blocks, and an adjustable beltsupport disposed' below the blocks.

5. In a sandpapcring-machine, a pair of abrading-belts, a pair of pressure-blocks coacting therewith and provided with cushioned faces, and adjustable bed-pieces upon which the blocks are mounted.

6. In a4 sandpapering-machine, a pair of abrading-belts, and means for placing the same under requisite tension, a pair of springpressed work-guides disposed above the belts, a work-support disposed below thebelts, adjustable pressure blocks coacting with the belts,and means for supporting the lower edges of the belts and holding them from vibration.

7. In asandpapering-machine, the combination with a pair of abrading-belts, of cushioned adjustable pressure-blocks, and cushioned adjustable work-guides. i

8. In asandpapering-machine, the combination with a pair of abrading-belts, of a pair of adjustable bed-pieces, a pair of cushioned pressure-blocks carried thereby and adapted for arcuate adjustment, means carried by the blocks to deflect the work-belts, and adjustable work-guides disposed above the blocks.

9. In `a sandpapering-machine, a pair of abrading-belts, a pair of pressure-blocks coacting therewith and provided with cushioned faces, and metallic shields covering the cushions.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures 1n the presence of two witnesses.

GEORGE P. HARMAN. FRANK L. CROOKS.

I/Vitnesses:

C. N. CORNELIUS, J. S. BoUER. 

